California authorities are scouring surveillance video taken at gates surrounding the U.S. Marine Corps base where missing military spouse Erin Corwin was last seen, a military spokesman told FoxNews.com.

Capt. Justin Smith, a spokesman for the Marine Corps base in Twentynine Palms, said security footage was given to detectives with the San Bernardino County Sheriff's Department for review, after Corwin was last seen leaving the base and later reported missing. It's not known what clues, if any, the videos might have provided.

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Corwin, who is 19 and pregnant, was last seen at 7 a.m. on Saturday, June 28, leaving her home on the base and heading for Joshua Tree National Park, her husband, Marine Cpl. Jonathan Corwin, told investigators.

Corwin reported his wife missing the next day. Police located her 2013 Toyota Corolla in Twentynine Palms on June 30, but declined to say whether any potential evidence had been removed from the vehicle.

On Monday, as the search entered its third week, Marines on the base joined together in a gathering organized by a Navy chaplain.

"He invited other military families out as a kind of closed-door support group," Smith told FoxNews.com.

"The mood in here is somber," but hopeful, he said. "Everyone's anxious for her to come home. We all look forward to her return."

Smith noted that the base's officials have been assisting San Bernardino authorities from the day Corwin was reported missing, though he declined to elaborate in detail. He said the young woman's photograph, description and vehicle information was distributed by base officials immediately following the news of her disappearance.

Smith described the Twentynine Palms area as "generally pretty safe" and said the base "maintains and enjoys close ties with the local community."

Officials from the San Bernardino County Sheriff’s Department did not return calls Tuesday, but Cpl. Randy Naquin, public affairs officer with the San Bernardino County Sheriff’s Department, told FoxNews.com last week that the department is "utilizing every resource we have" in locating Corwin, including canine and helicopter units, as well as search-and-rescue teams with expertise in tracking.

Naquin described the vast desert park as roughly the size of Rhode Island, with sandy and rocky terrain and temperatures in the triple digits.

Naquin described Jonathan Corwin as cooperative but declined to comment on whether his home, car and computer had been examined by authorities.

According to local media reports, Jonathan Corwin told investigators his wife -- a volunteer who worked with mistreated horses -- wanted to scout out the park in advance of a planned family visit. The Corwins are originally from Oak Ridge, Tenn., and Erin Corwin's mother had planned to visit her for her birthday in the coming weeks. Mother and daughter had already purchased tickets to visit SeaWorld, authorities said, and Erin Corwin had no known medical or psychological issues.

Corwin is described as 5 feet, 2 inches tall and 120 pounds, with brown hair and blue eyes.

Anyone with information on her whereabouts is urged to call the San Bernardino County Sheriff’s Specialized Investigation Division at (909) 387-3589 or sheriff’s dispatch at (909) 387-8313. Callers who wish to remain anonymous can contact the WeTip hotline at (800) 782-7463.